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CVE-2022-31103— Improper handling of CSS at-rules in lettersanitizer

Quick assessment

Affected
mat-sz lettersanitizer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

lettersanitizer是Mat Sz个人开发者的一个用于浏览器内电子邮件呈现的基于 DOM 的 HTML 电子邮件清理程序。 lettersanitizer 1.0.2 之前版本存在代码问题漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 7.5 · High EPSS 1.49% · P73

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-31103

Vulnerability Information
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Vulnerability Title
Improper handling of CSS at-rules in lettersanitizer
Source: CVE Program / CVE List V5
Vulnerability Description
lettersanitizer is a DOM-based HTML email sanitizer for in-browser email rendering. All versions of lettersanitizer below 1.0.2 are affected by a denial of service issue when processing a CSS at-rule `@keyframes`. This package is depended on by [react-letter](https://github.com/mat-sz/react-letter), therefore everyone using react-letter is also at risk. The problem has been patched in version 1.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
lettersanitizer 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lettersanitizer是Mat Sz个人开发者的一个用于浏览器内电子邮件呈现的基于 DOM 的 HTML 电子邮件清理程序。 lettersanitizer 1.0.2 之前版本存在代码问题漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mat-sz lettersanitizer < 1.0.2 -

II. Public POCs for CVE-2022-31103

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III. Intelligence Information for CVE-2022-31103

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Patches & Fixes for CVE-2022-31103 (1)

Vendor Advisories for CVE-2022-31103 (1)

Other References for CVE-2022-31103 (1)

IV. Related Vulnerabilities

Same weakness: CWE-754

V. Comments for CVE-2022-31103

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